Android基础教程——调节系统屏幕亮度

import android.app.Activity;
import android.content.ContentResolver;
import android.provider.Settings;
import android.provider.Settings.SettingNotFoundException;
import android.view.WindowManager;

public class ScreenBrightness {

	public static int getScreenBrightness(Activity activity) {
		int value = 0;
		ContentResolver cr = activity.getContentResolver();
		try {
			value = Settings.System.getInt(cr,
					Settings.System.SCREEN_BRIGHTNESS);
		} catch (SettingNotFoundException e) {

		}
		return value;
	}

	public static void setScreenBrightness(Activity activity, int value) {
		WindowManager.LayoutParams params = activity.getWindow()
				.getAttributes();
		params.screenBrightness = value / 255f;
		activity.getWindow().setAttributes(params);
	}
}

此类直接调用系统功能来调节屏幕参数！
注意如果调用

setScreenBrightness()

方法时传入的value值为0，那屏幕就全暗了，然后你的设备就一直暗着，直到重新启动系统了，所以在调用前最好先对传值进行下处理